The Collaborative International Dictionary of English v.0.48:

Disapproval \Dis`ap*prov"al\, n.
   Disapprobation; dislike; censure; adverse judgment.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disapproval
    n 1: a feeling of disliking something or what someone is doing
         [ant: approval]
    2: the expression of disapproval [ant: approval,
       commendation]
    3: an inclination to withhold approval from some person or group
       [syn: disfavor, disfavour, dislike, disapproval]
    4: the act of disapproving or condemning [ant: approval,
       approving, blessing]